Polymer lubricant

ABSTRACT

WHEREIN R IS ALKYL OF 12 TO 30 CARBON ATOMS ARE EMPLOYED AS LUBRICANTS FOR VINYL COMPOSITIONS.   N(-CH2-CO-NH-R)3   COMPOUNDS OF THE FORMULA

United States Patent Int. Cl. C08k 1/40, 1 /44 US. Cl. 26032.6 R 9 Claims ABSTRACT OF THE DISCLOSURE Compounds of the formula N(CH,(%NHR)3 wherein R is alkyl of 12 to 30 carbon atoms are employed as lubricants for vinyl compositions.

BACKGROUND OF THE lNVENTION Rigid vinyl chloride polymers are difiicult to fabricate because the processing temperatures conventionally employed are very close to the temperatures at which the vinyl polymers begin to degrade. Additionally, as the molecular weight of vinyl polymers such as rigid polyvinylchloride, Which is known for its excellent chemical resistance, self-extinguishing characteristics, strength and weatherability, increases, the mechanical properties improve but fabrication becomes even more difficult. Thus, the need for polymer lubricants is apparent. The present invention provides novel lubricants which have outstanding efliciency, compatibility and provide improved clarity for rigid vinyl systems.

It is the object of this invention to provide new polymer lubricants for rigid vinyl compositions. It is also the object of this invention to provide polymer lubricants having increased efiiciency. A further object of the invention is to provide lubricants which are compatible with rigid vinyl compositions. A still further object is to provide lubricants which will in turn provide improved clarity to the resulting polymeric object. Other objects will become apparent to those skilled in the art from the following detailed description.

SUMMARY OF THE INVENTION This invention relates to new polymer lubricants. More particularly, this invention relates to the use of compounds of the formula II N (CHzC NH R)3 wherein R is alkyl of 12 to 30 carbon atoms as polymer lubricants for vinyl polymers.

DESCRIPTION OF THE INVENTION In accordance with the invention, novel polymer lubricants are provided which are nitrilo tris(-N-acetamide)s of the formula wherein R is alkyl of 12 to 30 carbon atoms, preferably 15 to carbon atoms, the nitrilo tris(N-acetamide)s can be prepared by the ammonolysis of an ester with a primary amine or can be produced in accordance with 00- pending application Ser. No. 741,201, filed June 28, 1968. The process of the copending application comprises forming a polyhydroxy ester of ingredients comprising nitrilotriacetic acid and a glycol, and thereafter reacting said polyhydroxy ester with a compound selected from the group consisting of ammonia, primary amines, secondary amines and mixtures thereof, wherein said compound has a dissociation constant of less than 1X10- Typical nitrilo tris('N-acetamide)s include nitrilo tris- (N dodecylacetamide); nitrilo tris(tN pentadecylacetamide); nitrilo tris(N hexadecylacetamide); nitrilo tris- (N-stearylacetamide); nitrilo tris (-N-octadecylacetamide); nitrilo tris(N-behenylacetamide); nitrilo tris(.N-tetracosylacetamide); nitrilo trisQN-tallowacetamide); and the like.

The nitrilo tris(N-acetamide)s are employed in con junction with vinyl polymers and copolymers. Thus, the polymers employed include the following well-known and widely-used products: polyvinyl acetate, polyvinyl chloride, polyvinyl chloride acetate copolymer, polyvinyl acetals such as polyvinylacetal and polyvinylbutyral and the like, polyvinylidene chloride and the like. The vinyl polymers and copolymers can be either rigid or flexible (plasticized) but are preferably rigid. The preferred vinyl polymer or copolymer is polyvinyl chloride. The vinyl polymers or copolymers can contain a variety of additives in order to provide a means of producing finished products with literally any desired properties. Typical additives include stabilizers, such as tin, barium, cadmium, calcium, zinc, and lead; plasticizers such as dioctylphthalate, tricresylphosphate, dibutoxyethylphthalate, triglycol di-(2-ethylhexanoate) and the like; dyes; pigments; solvents; heat stabilizers such as alkaline earth carbonates, hydroxides, oxides and salts; fillers; and the like.

The nitrilo tris(N-acetamide)s are mixed with vinyl polymer or copolymer in a proportion sufiicient to provide the desired lubrication, i.e., a lubricating amount. It has been found that because of the efliciency of the nitrilo tris(N-acetamide)s, only a proportion of the amount of lubricant conventionally used need be employed. Generally, the nitrilo tris(.N-acetamide) is about 0.1 to about 5 percent based on the total Weight of the composition and preferably about 0.2 to about '2 weight percent.

The following examples are presented to illustrate the invention but are not intended to limit it. Throughout the specification and claims, all parts and percentages are by weight and temperatures in degrees centigrade unless specified other-wise.

EXAMPLE 1 Preparation of nitrilo tris(N-stearylacetamide) A charge of 567 grams of nitrilo tris(2-ethylhexyl acetate), 131 grams of ethylene glycol, 500 grams of 2- ethylhexanol and 980 grams of stearylamine was heated at 112 degrees centigrade until titration indicated that the reaction was complete. This took 22 hours. The product was recrystallized from isopropyl alcohol. The yield was 71 percent and the product had a melting point of 110 112 degrees centigrade.

EXAMPLE 2 About 760 parts ethylene glycol and about 106 parts nitrilotriacetic acid were esterified at ZOO-250 C. for 5 hours under a nitrogen sparge. Nitrilo tris(N-stearylacetamide) was prepared by heating a charge of 1433 grams of crude ethylene glycol triester of nitrilotriacetic acid at -80 C. and adding 2135 grams of stearylamine over a period of 50 minutes. The temperature was raised to 112 C. until titration indicated the reaction was complete. This took 3.5 hours. The product was recrystallized from isopropyl alcohol. The yield was 90.5% and the product had a melting point of 109-1105 C.

EXAMPLE 3 Nitrilo tris(N-stearylacetarnide) as a polymer lubricant Nitrilo tris(N-stearylacetamide), 0.25 part was mixed with parts of rigid polyvinyl chloride and tested in an electric bowl Brabender Plasti-Corder at 130 C. and

the time from introduction of the sample to fusion was measured. The time to fusion was 9 minutes and the torque at fusion peak was 5400 mg. The foregoing was inch and it was observed that the color and clarity of the final composition was good.

EXAMPLE 7 repeated except that calcium stearate was employed as About Weight P 0f .llitnlo ifl y the lubricant. The time for the calcium stearate lubricant acetamldfi) Was compounded with flgld PQ YY Y Chlorlde sample to fu e was 2.5 minute and th torque f i and bottles were molded from the compositlon. The botpeak was 5000 mg. A comparison of fusion time indicates i exhibited flfceneni impact Strength, Clarity f that the nitrilo tris(N-stearylacetamide) is a more efficient slslance cfallng When bent- The eXCelleIlt dficlency external lubricant than cal ium t t of the lubrlwnt is demonstrated by the small amount employed. Additionally, several bottles were subjected to a EXAMPLE 4 water blush test. Clear polyvinyl chloride tends to water Three samples were prepared employing 100 parts of blush, i.e., develop a whitish cast, upon aging. In this rigid polyvinyl chloride, 1 part of Thermolite 66 (tin test, the bottles were aged in 57 degrees centigrade distilled mercaptide stabilizer) and 0.25 part of lubricant. The water for 1 month. This period of time roughy correcornpositions were tested on a Brabender Plasti-Corder sponds to about 1 year of shelf exposure. The bottles did and an oil bowl was employed to minimize frictional heat not exhibit water blush during the test. build-up. The oll bowl temperature was l70 degrees cen- EXAMPLE 8 tigrade. The fusion times and torque at fusion peak are i given i T bl I, Nitrilo tr1s(N-tall0wacetam1de) as a polymer lubricant TABLE 1 Nitrilo tris(N-tallowacetamide) was prepared by fol- Torque at Mix lowing the procedure of Example 1 substituting tallow Fusion fusion visco sity amine (Foremost Chemical Products Co.) for the stearyl- Lubricant 3 3 at 8 amine. A sample was prepared by mixing 0.5 part of the nitrilo tris(N-tallowacetamide), 0.5 part Thenmolite 66 llthiiiili?Ylt'fittfitfk: it 32% 11 7 55 and 100 Parts of rigid Polyvinyl chloride A second Hoechst Wax or 9.5 2, 400 1,750 pic was prepared in which the acetamide was replaced by calcium stearate. The samples were tested in a Brabender The nitrilo tris(N-stearylacetamide) is the most efiicient Plastic-corder at 180 degrees centigrade and 40 revoluexternal lubricant as judged by fusion time. tions per minute. The results are given in Table III.

EXAMPLE 5 TABLE III The nitrilo tris(N-stearylacetamide) was compared to Fusion at M time fusion viscosity various commercial lubricants and the results of the corn- Lubricant (minutes) time 1 1 mg.) are Shown m p composlmn tested 35 Nitrilotris(N-tallowacetamide)- 1.0 2,400 1,800 contained 100 parts of rigid polyvinyl chloride, 1 part Caloiumstearate 4.5-5 2,000 1, 500 lubricant and 5 parts of M&T T-3l (tin mercaptide stabilizer). All formulations were milled for 1 hour or un- The foregoing results indicate that the nitrilo tris(N-taltil the composition stuck to the mil roll and a sample lowacetamide) is a more efiicient external lubricant than was taken at 5, 10, 20, 30, 40, and 50 minutes to observe calcium stearate. stability and lubricity. Also, a large sheet was taken at Various modifications can be made in the invention 10 minutes for press polish clarity evaluation. The mill without departing from the spirit and scope thereof. The setting was 0.020 inch. Drag is a term used to describe various embodiments of the invention disclosed herein the property of the sheet to cling to the mill roll while serve to further illustrate the invention but are not innot actually sticking. The Brabender conditions were 350 tended to limit it. Fahrenheit at 100 revolutions per minute. A S-minute wait- We claim: ing period was observed between each sample in order to 1. A composition comprising (1) a vinyl polymer or allow the heat in the machine to return to the starting copolymer selected from the group consisting of polyvinyl point. chloride, polyvinyl acetate, polyvinyl acetal, polyvinyl TABLE II Brabender time to maximum Sticking Relative fusion Drag on to mill, fusion Relative torque, Lubricant mill minutes on mill clarity minutes Nitrilo tris (N-stearylacetamide) Low Slow Fair/good-.- 2% Calcium stearate Low 30 Fast Poor 25/ Mark TT None 25/30 do Good 2% Advawax 140 5 No sample 1 Advawax 280. 5 .do do 2% Polyethylene 40 Acrawax B. 2 Fast 1% Acrawax C.

Mineral oil- 1 No sticking. I Did not fuse (10 min.).

This table demonstrates that the nitrilo tris(N-stearylacetamide) was the most effective of the foregoing lubricants.

EXAMPLE 6 A flexible polyvinyl chloride composition was prepared employing 100 parts of polywinyl chloride, parts diisooctylphthalate, 1 part of BC100 (Ba/Cd stabilizer) and 0.5 part nitrilo tris(N-stearylacetamide). The com- 0 N(CH2 NHR) wherein R is alkyl of 12 to 30 carbon atoms.

2. A composition in accordance with claim 1 wherein position was milled at 340 F. with a mill setting of 0.020 said lubricant is nitrilo tris(N-steary1acetamide).

3. The composition of claim 2 wherein said vinyl poly- 9. A composition of claim 8 wherein said vinyl polymer or copolymer is polyvinyl chloride. mer is rigid polyvinyl chloride.

4. The composition of claim 3 wherein said vinyl polymer or copolymer is rigid polyvinyl chloride. References cued 5. A composition in accordance with claim 1 wherein 5 UNITED STATES PATENTS said lubricant is nitrilo tris(N-tallowaceta-mide). 3,326,974 6/1967 Rainer 260--557 6. A composition according to claim 5 wherein said vinyl polymer is Polyvinyl chloride FHEODORE MORRIS, Primary Examiner 7. The composition of claim 6 wherein said vinyl poly- T. DE BENEDICTIS, SR., Assistant Examiner mer is rigid polyvinyl chloride. 10 U S cl X R 8. A composition of claim 1 wherein said vinyl poly mer is polyvinyl chloride. 558 561 K 

